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1,1,1-Trichloroethane

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CAS Number: 71-55-6

1,1,1-Trichloroethane (CAS 71-55-6) is a chemical tracked by the EPA Toxics Release Inventory (TRI) program under Section 313 of the Emergency Planning and Community Right-to-Know Act. The TRI requires industrial facilities above specified threshold quantities to disclose annual manufacturing, processing, and otherwise-used volumes, along with quantities released to air, water, land, and off-site transfers.

Across the United States, 34 facilities have filed TRI Form R disclosures for 1,1,1-Trichloroethane, with a cumulative reported release volume of 254.3K lbs. The chemical is not flagged as a carcinogen in the TRI classification set. The largest individual disclosure in the current dataset comes from WESTLAKE US 2 LLC in LA at 170.8K lbs.

TRI volumes are self-reported estimates, not measured stack emissions, and each pound counts equally regardless of chemical toxicity, so total pounds should not be equated with total risk. Inclusion of a chemical or facility in the TRI does not itself establish a health hazard; it documents the public right-to-know record. Consult EPA's IRIS (Integrated Risk Information System) and the Agency for Toxic Substances and Disease Registry for health-effect summaries.

Release Summary

Total Releases
254.3K lbs
Number of Facilities
34
Carcinogen
No
Persistent Bioaccumulative Toxicant
No

Which facilities release the most of this chemical?

Facilities with the largest reported releases of 1,1,1-Trichloroethane. Up to 50 shown.

# Facility Release (lbs)
1 Westlake US 2 LLC 170.8K lbs
2 US Doe Waste Isolation Pilot Plant 26.9K lbs
3 Burlington Environmental LLC 18.2K lbs
4 Arkema Inc 16.2K lbs
5 Formosa Plastics Corp Texas 8.2K lbs
6 Formosa Plastics Corp Louisiana 6.6K lbs
7 Keystone Cement Co 2.3K lbs
8 Buzzi Unicem Usa-Greencastle Plant 2.3K lbs
9 Westlake Vinyls Inc 1.3K lbs
10 Elemental Environmental Solutions LLC 443 lbs
11 Clean Harbors Environmental Services Inc 329 lbs
12 Safety-Kleen Systems Inc. 243 lbs
13 Veolia Es Technical Solutions LLC Port Arthur Facility 206 lbs
14 Heidelberg Materials US Cement LLC 148 lbs
15 Holcim (us) Inc Holly Hill Plant 47 lbs
16 Clean Harbors Deer Park LLC 45 lbs
17 Clean Harbors Aragonite LLC 41 lbs
18 Reworld Tron Corp 37 lbs
19 Lambcon Inc. 30 lbs
20 Westlake Chemicals & Vinyls LLC 20 lbs
21 Clean Harbors el Dorado LLC 10 lbs
22 Lambcon Ready Mix 10 lbs
23 Lambcon Inc. 10 lbs
24 Lambcon 10 lbs
25 Lambcon Ready Mix 10 lbs
26 Heritage Thermal Services 6 lbs
27 Desotec US LLC Darlington Facility 5 lbs
28 Ross Incineration Services Inc 2 lbs
29 Freeport_olin Bc 1 lbs
30 Dow Chemical Co Freeport Facility 1 lbs
31 Buzzi Unicem Usa-Cape Girardeau 1 lbs
32 Blue Cube Operations LLC - Plaquemine Site 0 lbs
33 Norlite LLC 0 lbs
34 Arcwood Environmental - Orange LLC 0 lbs

Frequently Asked Questions

What is 1,1,1-Trichloroethane? ▼
1,1,1-Trichloroethane (CAS Number: 71-55-6) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. 34 facilities in the United States report releasing this chemical to the EPA.
How much 1,1,1-Trichloroethane is released in the U.S.? ▼
U.S. facilities have reported a total of 254.3K lbs of 1,1,1-Trichloroethane releases to the EPA Toxic Release Inventory across 34 facilities. Release quantities are self-reported estimates. This includes releases to air, water, land, and off-site transfers.
Is 1,1,1-Trichloroethane harmful to health? ▼
1,1,1-Trichloroethane is not classified as a carcinogen in the EPA TRI database. Health effects depend on exposure levels, duration, and route. For specific health questions, consult a toxicologist or your local health agency.
Which facilities release the most 1,1,1-Trichloroethane? ▼
The largest reported releasers of 1,1,1-Trichloroethane include facilities across multiple states. Release data is self-reported annually to the EPA under the TRI program. View the full list of 34 facilities on this page.
What is the CAS number for 1,1,1-Trichloroethane? ▼
The CAS (Chemical Abstracts Service) Registry Number for 1,1,1-Trichloroethane is 71-55-6. CAS numbers are unique numerical identifiers assigned to every chemical substance described in the open scientific literature. This identifier is used to search scientific databases and regulatory filings.

Related Guides

Understanding TRI Data
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Biggest Polluters in America
Which facilities release the most toxics
How to Check Environmental Quality
Step-by-step guide to checking your local environment

Health Information

Data comes from the EPA Toxic Release Inventory (TRI) program. Release quantities are self-reported by facilities and may represent estimates. The total shown aggregates reports across all facilities and reporting years.

PlainEnviro presents this data without advocacy framing. The presence of a chemical in the TRI database does not by itself indicate a health risk at current exposure levels. For health-related questions about specific chemical exposures, consult your local health agency or a toxicologist.

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Data sourced from the U.S. Environmental Protection Agency (EPA). See our methodology for details. Retrieved and formatted by PlainEnviro Editorial

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the EPA Toxic Release Inventory (TRI). Consult a qualified professional before making decisions based on this data.

Read our methodology - how this data is sourced, computed, and verified.